[PATCH] gdb.python/py-events.exp and normal_stop observers ordering

[Pedro Alves <palves at redhat dot com>]

I have patches that:

 1 - make the CLI print stop info from a normal_stop observer, like MI
     does.

 2 - happen to change the order in which the Python and CLI/TUI
     normal_stop observers are installed.

With those in place, py-events.exp regresses like shown below [1],
because the Python stop events are output before CLI prints stop info,
instead of after, and the test doesn't expect that.

With the same Python hooks, the order in which MI and Python events is
emited today is already undefined, because MI also uses the
normal_stop observer for output.  I see no reason that we should in
general define the order observers, interpreters and scripting
languages get their turn at being notified of these events.  So this
patch makes the test cope with Python->CLI output order too.

Tested on x86_64 Fedora 20.

gdb/testsuite/
2015-07-09  Pedro Alves  <palves@redhat.com>

	* gdb.python/py-events.exp: Accept output between the stop event
	and the prompt.
	* gdb.python/py-evsignal.exp: Likewise.
	* gdb.python/py-evthreads.exp: Likewise.

[1] - The regressions in question look like:

Before said patches:
  (gdb) continue
  Continuing.
  event type: continue

  Breakpoint 2, first () at /home/pedro/gdb/mygit/build/../src/gdb/testsuite/gdb.python/py-events.c:30
  30	  for (i = 0; i < 2; i++)
  event type: stop
  event type: stop
  stop reason: breakpoint
  first breakpoint number: 2
  breakpoint number: 2
  breakpoint number: 3
  all threads stopped
  (gdb) PASS: gdb.python/py-events.exp: continue

After said patches:
  (gdb) continue
  Continuing.
  event type: continue
  event type: stop
  event type: stop
  stop reason: breakpoint
  first breakpoint number: 2
  breakpoint number: 2
  breakpoint number: 3
  all threads stopped

  Breakpoint 2, first () at /home/pedro/gdb/mygit/build/../src/gdb/testsuite/gdb.python/py-events.c:30
  30	  for (i = 0; i < 2; i++)
  (gdb) FAIL: gdb.python/py-events.exp: continue
---
 gdb/testsuite/gdb.python/py-events.exp    | 4 ++--
 gdb/testsuite/gdb.python/py-evsignal.exp  | 2 +-
 gdb/testsuite/gdb.python/py-evthreads.exp | 8 ++++----
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/gdb/testsuite/gdb.python/py-events.exp b/gdb/testsuite/gdb.python/py-events.exp
index 2d89eb6..f880b84 100644
--- a/gdb/testsuite/gdb.python/py-events.exp
+++ b/gdb/testsuite/gdb.python/py-events.exp
@@ -65,7 +65,7 @@ gdb_test "continue" ".*event type: continue.*
 .*first breakpoint number: 2.*
 .*breakpoint number: 2.*
 .*breakpoint number: 3.*
-all threads stopped"
+all threads stopped.*"
 
 # Test that when "step N" trips on a breakpoint, we get a stop event
 # with breakpoint stop reason.
@@ -75,7 +75,7 @@ gdb_test "step 3" ".*event type: continue.*
 .*stop reason: breakpoint.*
 .*first breakpoint number: 4.*
 .*breakpoint number: 4.*
-all threads stopped"
+all threads stopped.*"
 
 delete_breakpoints
 
diff --git a/gdb/testsuite/gdb.python/py-evsignal.exp b/gdb/testsuite/gdb.python/py-evsignal.exp
index c90be8a..ea7b73b 100644
--- a/gdb/testsuite/gdb.python/py-evsignal.exp
+++ b/gdb/testsuite/gdb.python/py-evsignal.exp
@@ -38,7 +38,7 @@ gdb_test_no_output "set non-stop on"
 
 gdb_run_cmd
 gdb_test_multiple "" "Signal Thread 3"  {
-    -re "event type: stop\r\nstop reason: signal\r\nstop signal: SIGUSR1\r\nthread num: 3\r\nevent type: stop\r\n$gdb_prompt $" {
+    -re "event type: stop\r\nstop reason: signal\r\nstop signal: SIGUSR1\r\nthread num: 3\r\nevent type: stop\r\n.*$gdb_prompt $" {
         pass "thread 3 was signaled"
     }
     -re "The target does not support running in non-stop mode"  {
diff --git a/gdb/testsuite/gdb.python/py-evthreads.exp b/gdb/testsuite/gdb.python/py-evthreads.exp
index 4c9a53a..5a4f491 100644
--- a/gdb/testsuite/gdb.python/py-evthreads.exp
+++ b/gdb/testsuite/gdb.python/py-evthreads.exp
@@ -48,7 +48,7 @@ gdb_breakpoint "thread3"
 gdb_run_cmd
 set test "Run to breakpoint 1"
 gdb_test_multiple "" $test {
-    -re "event type: stop\r\nstop reason: breakpoint\r\nfirst breakpoint number: 1\r\nbreakpoint number: 1\r\nthread num: 1\r\n$gdb_prompt $" {
+    -re "event type: stop\r\nstop reason: breakpoint\r\nfirst breakpoint number: 1\r\nbreakpoint number: 1\r\nthread num: 1\r\n.*$gdb_prompt $" {
         pass $test
     }
     -re "The target does not support running in non-stop mode" {
@@ -57,17 +57,17 @@ gdb_test_multiple "" $test {
     }
 }
 
-gdb_test "next" "event type: stop\r\nstop reason: breakpoint\r\nfirst breakpoint number: 2\r\nbreakpoint number: 2\r\nthread num: 2" "reached breakpoint 2"
+gdb_test "next" "event type: stop\r\nstop reason: breakpoint\r\nfirst breakpoint number: 2\r\nbreakpoint number: 2\r\nthread num: 2.*" "reached breakpoint 2"
 
 gdb_test "thread 2" {\[Switching to thread 2 .*}
 
-gdb_test "next" "event type: stop\r\nstop reason: breakpoint\r\nfirst breakpoint number: 3\r\nbreakpoint number: 3\r\nthread num: 3" "reached breakpoint 3"
+gdb_test "next" "event type: stop\r\nstop reason: breakpoint\r\nfirst breakpoint number: 3\r\nbreakpoint number: 3\r\nthread num: 3.*" "reached breakpoint 3"
 
 gdb_test "thread 3" {\[Switching to thread 3 .*}
 
 set test "continue thread 1"
 gdb_test_multiple "continue&" $test {
-    -re "event type: continue\r\nthread num: 3\r\n$gdb_prompt " {
+    -re "event type: continue\r\nthread num: 3\r\n.*$gdb_prompt " {
 	# This expect string must not expect the end-of-buffer '$'.
         pass $test
     }
-- 
1.9.3